When First LadyMartha Logan told Agent Thompson that she suspected that Agent Aaron Pierce was in trouble, Agent Adams arrived and told her that President Charles Logan wanted to speak with her. He escorted her to a library, but locked her inside as per the President's orders. He stood guard at the door while Martha screamed to be let out. Logan later had Adams let him in to speak with her.

Adams later watched over Agent Pierce, who was restrained for his efforts in uncovering the President's involvement in the Sentox nerve gas conspiracy. Recommending that Logan have Pierce killed, Adams told Logan that, having worked with Aaron for years, he knew Aaron was loyal to David Palmer. He is eventually ordered to kill Aaron. He led Aaron to a car and told him to get in the trunk. Aaron refused, and attempted to escape, but Adams threatened him with his gun. Martha suddenly arrived, so Adams turned his gun on her, but Martha walked up to him and asked if he would really shoot the First Lady. Adams took out his cellphone and threatened to call for help, but Aaron kicked him and knocked his gun out of his hands. When Adams grabbed a crowbar in the trunk and moved to beat Pierce, Martha shot and killed him with the pistol.

Martha later brought Mike Novick to help Aaron. Pierce tells Mike that Adams tried to kill him, and shows him the corpse as proof.

It is possible that Justin Adams was the man who killed Walt Cummings, helping Charles Logan frame Cummings for his 'actions' on Day 5. He would have been the one who made the murder look like a suicide, though that, or the killing as a whole, could be attributed to an as-of-yet unknown minor conspirator within the Presidential Retreat.